T1200131 Grounding and Shielding at LIGO
D2300383 SUS BSC2 HAM3 HAM4 (susb2h34) System Wiring Diagrams

A summary of closeout activities for BSC2 and HAM3:

BBSS OSEM                             Cable
TOP F1, F2                                BS_081
TOP F3, SD                               BS_082
TOP LF, RT                                BS_083
Middle UL, LL, UR, LR               BS_084
Bottom UL, LL, UR, LR              BS_384

Issue: Pin 10 on cable BS_082 grounded to chamber ground, QOSEM replaced alog 90834.

PR2 OSEM                               Cable
TOP F3, LF, RT, SD                  HAM3_003
Middle UL, LL, UR, LR              HAM3_025
Bottom UL, LL, UR, LR             HAM3_026

Issue: Pin 13 on cable HAM3_025 grounded to chamber ground. Found cable shield grounding to backshell of air-cable on feedthrough side. Cable jacket had pulled back. Reassembled the backshell. As precaution cable HAM3_026 was also reassembled.

MC2 OSEM                              Cable
TOP F1, F2, F3, LF                  HAM3_001
TOP RT, SD / PR2 F1, F2        HAM3_002
Middle UL, LL, UR, LR             HAM3_019
Bottom UL, LL, UR, LR            HAM3_020

Issue: Cables 19 and 20 had pin 13 grounded to chamber ground. Jim was able to move cables inside chamber to clear shorts. Old style cables with the shield protruding out.

All cable issues resolved. All pins are isolated from chamber ground and pin13 is tied to backshell.